Handloads for Sig Rattler

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dellet
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Re: Handloads for Sig Rattler

Post by dellet » Mon Oct 12, 2020 9:26 am

jakeAMP wrote:
Sat Oct 10, 2020 4:54 pm
dellet wrote:
Sun Oct 04, 2020 8:30 pm
jakeAMP wrote:
Sun Oct 04, 2020 5:16 pm
Hey folks, been a minute. I FINALLY got a chance to work up a load with N110 and test it.

I used the same brass, primers, and bullets as my H110 load, but I used 9.8gr of N110 and seated to a COAL of 2.21.

You guys were totally right about N110, it’s completely hearing safe, not nearly as blasty as the H110. It cycles both suppressed and unsuppressed. It does NOT lock my Rattler’s bolt back unsuppressed, and it seems to be a 50/50 shot whether it’ll lock back suppressed. Not sure what to do about that, I don’t want to increase pressures any further because the velocity is right where I want it. Not a huge deal for me though, I’m thinking I’ll probably still use H110 for the “business” loads, if you will, or I might work up a super load with N110 later. In fact, I think I might try that next weekend.

But I digress. Again, refer to my last H110 load for cases, primers, bullets, but with 9.8gr of N110 and a COAL of 2.21, I was getting between 1030-1060fps, with a three inch group at 50 yards with no signs of instability. STD DEV was 13~

Cheers, folks, stay safe.
If you have room move the bullet out .020”
I backed them out to a COAL of 2.23, no notable changes.
Moving the bullet out does two things, drops peak pressure and velocity. Dropping peak pressure, increases port pressure for cycling.

You can try moving the bullet out a bit more, as velocity drops add a bit of powder to get it back. The combination and possibly playing with a crimp is generally enough to push reliability over the edge on a load that is almost there.

Also check for leaks in the gas system.
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jakeAMP
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Re: Handloads for Sig Rattler

Post by jakeAMP » Mon Oct 12, 2020 7:35 pm

Right on, I’ll play around with it a little bit this weekend, thanks dellet 🤙

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Re: Handloads for Sig Rattler

Post by jakeAMP » Sat Oct 17, 2020 10:13 am

So I backed the bullets out to 2.245 or so, and weirdly enough I still saw no notable difference. Velocity was still right around 1050, still had reliable ejection, but still could not lock back. Would you think it advisable to back it out even further?

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dellet
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Re: Handloads for Sig Rattler

Post by dellet » Sun Oct 18, 2020 12:09 am

How about posting current, complete load data and is this with without a suppressor that you can’t get bolt lock?

I generally start with a a powder charge that is reliable for function then manipulate the old for function. It’s surprising what a .1 grain change can do.
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Re: Handloads for Sig Rattler

Post by jakeAMP » Sun Oct 18, 2020 12:15 am

Sure thing, current data for the N110 load is as follows:

Bullet: Sierra 220gr HPBT Matchking

Case: Converted Lake City (Fancy Brass Co.)

Powder: N110

Charge: 9.8gr

Primer: Winchester Small Rifle

COAL: 2.24”

Avg Velocity: 1054


Cycles reliably with/without suppressor, does not lock back either way.

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dellet
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Re: Handloads for Sig Rattler

Post by dellet » Sun Oct 18, 2020 12:45 am

Do you have a load that does lock back all the time?
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Re: Handloads for Sig Rattler

Post by jakeAMP » Sun Oct 18, 2020 11:05 am

Yeah, the H110 load a couple pages back runs perfectly, I was just trying to get N110 to work because it does seem a bit quieter and takes a smaller charge. I’m wondering if I should try 200gr bullets with the N110.

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dellet
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Re: Handloads for Sig Rattler

Post by dellet » Sun Oct 18, 2020 12:03 pm

I would max out the load and work back.

Probably 10.5 grains at 2.26”. That might go super depending on temp but probably around 1125 fps. If that does not get the bolt locking back it might be a bad combination for the Rattler.

If the 10.5 works, depending on velocity, Then drop the load to split the difference to around 10.2/3. The faster powders can be an exercise in frustration to get working and changes of .1 grain of powder or .010” seated depth can make a huge difference.

In general if I have a working load with H110, I drop it .5 for N110.

What is interesting is they the suppressor does not push the load over the edge for reliable bolt hold open. Generally that is enough back pressure. A good deep clean and lube might be worth while.
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Re: Handloads for Sig Rattler

Post by jakeAMP » Sun Oct 18, 2020 4:36 pm

Awesome, I’ll give that a shot next weekend.

I’m using an OSS, so while there is *some* added back pressure, it’s not nearly the amount that most cans would induce.

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